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[ Upstream commit 6a96fb653b6481ec73e9627ade216b299e4de9ea ] Return IO errors if an ->iomap_begin implementation returns an IOMAP_INLINE buffer but forgets to set the inline_data pointer. Filesystems should never do this, but we could help fs developers (me) fix their bugs by handling this more gracefully than crashing the kernel. Signed-off-by: Darrick J. Wong <djwong@kernel.org> Link: https://lore.kernel.org/175803480324.966383.7414345025943296442.stgit@frogsfrogsfrogs Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Christian Brauner <brauner@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>